sole lifts

sole lifts

soling material added to the entire outsole of a shoe worn on the shorter leg to redress and balance leg length discrepancy; sole lift > 1cm thick should have a convex longitudinal profile (rocker profile) to facilitate ambulation
References in classic literature ?
The soles of these clogs are not what they seem to be, for each one is a sweet little box; and by twisting the second nail from the toe, the upper of the shoe and part of the sole lifts up like a lid, and in the spaces within are fourscore and ten bright golden pounds in each shoe, all wrapped in hair, to keep them from clinking and so telling tales of themselves.